To provide a lever supporting bracket structure for a small size surface boat capable of enhancing the rigidity of a lever supporting bracket and a tongue-shaped piece plug-in part, deciding the layout of the lever supporting bracket and the tongue-shaped piece plug-in part relatively easily, and furthermore reducing the number of components.

In the lever supporting bracket structure 30, a reverse bucket 21 is allowed to be operated with a reverse operation lever 34 which is disposed near the front end of a seat 23 and is mounted to the boat body 11 with the lever supporting bracket 30 in a movable manner, while the tongue-shaped piece plug-in part 55 capable of inserting the tongue-shaped piece part 51 of the seat 23 front end 50 into the lever supporting bracket 30 is integrally formed.